The D800 has OLP filter, that reduces the aliasing artifacts. Additionally the JPEG is smeared out. Comparing with the D800E would be more interesting. The IQ 180 has twice the megapixels, and that certainly helps but the IQ180 has also an unhealthy amount of aliasing. I suspect the image was added just to demonstrate aliasing.
An MFDB like mine P45+ would produce even more aliasing.
You can reduce aliasing by stopping down, so diffraction softens the image.
A7 / A7R problem with DPR Test Scene.
Just see 100% Sample compared with D800 and IQ180.
How is it possible these are so strong (whatever the ISO) and don't occur with the D800.
For lithography shooters, the MF is not dead !
Have a Nice Day.